Thanks for the additional technical details. But I don't think it changes anything.
> Bitcoin does not allow these kind of transactions to be used as input for another transaction unless a certain number of confirmations has passed.
This means that in the hypothetical attack case, where 1008 blocks are replaced by 1009 blocks by the 51% attacker... then 909 x 12.5 BTC are immediately usable. While the last 100 x 12.5 BTC will be usable in 1000 minutes later.
In either case, the 51% attacker mines blocks faster than literally everyone else combined. So there's no period where of waiting that is safe against a 51% attacker.
The 51% attack is the end-all-be-all of a coin. If it happens, the coin is hopelessly lost. The entire cryptographical nature of the coin depends on the 51% attack remaining infeasible.
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In any case, the 51% attacker's 1009 blocks is longer than the 1008 "honest blockchain". So the honest miners (by default) will mine the 1009-long blockchain after the 51% attack.
So the 51% attacker's coins are safe and will be spendable in short order. Perhaps the 49% honest miners can "blacklist" his coins, but with 51% of the hashrate, the 51% attacker can always legitimize his own coins by using his own 51% hardware (since he can build blocks faster than everyone else).
> Bitcoin does not allow these kind of transactions to be used as input for another transaction unless a certain number of confirmations has passed.
This means that in the hypothetical attack case, where 1008 blocks are replaced by 1009 blocks by the 51% attacker... then 909 x 12.5 BTC are immediately usable. While the last 100 x 12.5 BTC will be usable in 1000 minutes later.
In either case, the 51% attacker mines blocks faster than literally everyone else combined. So there's no period where of waiting that is safe against a 51% attacker.
The 51% attack is the end-all-be-all of a coin. If it happens, the coin is hopelessly lost. The entire cryptographical nature of the coin depends on the 51% attack remaining infeasible.
----------
In any case, the 51% attacker's 1009 blocks is longer than the 1008 "honest blockchain". So the honest miners (by default) will mine the 1009-long blockchain after the 51% attack.
So the 51% attacker's coins are safe and will be spendable in short order. Perhaps the 49% honest miners can "blacklist" his coins, but with 51% of the hashrate, the 51% attacker can always legitimize his own coins by using his own 51% hardware (since he can build blocks faster than everyone else).
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